mboeringa left a comment (osm2pgsql-dev/osm2pgsql#2360)
I'd be interested to hear about your test results using
ST_QuantizeCoordinates...
My preliminary testing using ST_QuantizeCoordinates even resulted in a dataset
of 14GB ending up at 15GB if I can trust DBeaver's relation size display
(woodland data of OpenStreetMap), which is the opposite of what I excepted. A
few other datasets gained only a marginal reduction in storage size (maybe
2-3%). Admittedly, my workflow has some more gears going on, but even taking
that into account, I have a hard time explaining such result.
Some thorough testing seems warranted though, as it appears your mileage may
vary depending on table contents.
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